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Transcriptional response of Pseudomonas aeruginosa PA3 to its phage gene product gp68

ABSTRACT: Transcriptional response of Pseudomonas aeruginosa PA3 to its phage gene product gp68

PROVIDER: PRJNA523578 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8602930_1.fastq.gz	Fastqsanger.gz
	SRR8602930_2.fastq.gz	Fastqsanger.gz
	SRR8602925_1.fastq.gz	Fastqsanger.gz
	SRR8602925_2.fastq.gz	Fastqsanger.gz
	SRR8602926_1.fastq.gz	Fastqsanger.gz

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Transcriptional response of Pseudomonas aeruginosa PA3 to its phage gene product gp68

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The phage-encoded protein PIT2 impacts bacterial quorum sensing in Pseudomonas aeruginosa by direct interaction with LasR

Project description:Quorum sensing (QS) is the cell density-dependent virulence factor regulator in Pseudomonas aeruginosa. Here, we elucidate PIT2, a phage-encoded inhibitor of the QS regulator LasR, derived from the lytic Pseudomonas phage LMA2. PIT2 inhibits the effectors PrpL and LasA of the type 2 secretion system of P. aeruginosa and attenuates bacterial virulence towards HeLa cells and in Galleria mellonella. Using RNAseq-based differential gene expression analysis, the effect of PIT2 on the LasR regulatory network was revealed. Moreover, the specific interaction between LasR and PIT2 was determined. These data expand our knowledge on phage-encoded modulators of the bacterial metabolism, as this examples an anti-virulence protein derived from a lytic phage. From an applied perspective, this phage protein reveals and exploits an interesting anti-virulence target in P. aeruginosa. As such, it lays the foundation for a new phage-inspired anti-virulence strategy to combat multidrug resistant pathogens and opens the door for SynBio applications.

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Whole transcriptome analysis of PBMCs stimulated with either a P. aeruginosa phage PNM lysate or with its bacterial host P. aeruginosa

Project description:The ability of bacteriophages to kill bacteria is well known, as is their potential use as alternatives to antibiotics. As such, bacteriophages reach high doses locally through infection of their bacterial host in the human body. In this study we assessed the gene expression profile, by means of whole transcriptome analysis, of peripheral blood mononuclear cells (PBMCs) derived from a healthy human donor and stimulated with a Pseudomonas aeruginosa phage PNM lysate, or P. aeruginosa strain 573. The PBMCs were stimulated for 20 h, followed by lysis of the cells and RNA extraction. In total, three stimulations were performed: control sample (i.e. not stimulated), P. aeruginosa phage PNM lysate and P. aeruginosa strain 573. Each stimulation was conducted in triplicate. The transcriptome analysis showed that the phage induce a clear immunological responses. Both pro- and anti-inflammatory genes were up-regulated in the PBMCs in the presence of the phage or its bacterial host. Our results indicate that bacteriophages might play a bigger role in the immune response then previously described and might have a broader effect than the clearing of bacterial infections alone, such as the suppression of the immune response to benefit their own survival.

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Project description:The basic biology of bacteriophage–host interactions has attracted increasing attention due to a renewed interest in the therapeutic potential of bacteriophages. In addition, knowledge of the host pathways inhibited by phage may provide clues to novel drug targets. However, the effect of phage on bacterial gene expression and metabolism is still poorly understood. In this study, we tracked phage–host interactions by combining transcriptomic and metabolomic analyses in Pseudomonas aeruginosa infected with a lytic bacteriophage, PaP1. Compared with the uninfected host, 7.1% (399/5655) of the genes of the phage-infected host were differentially expressed genes (DEGs); of those, 354 DEGs were downregulated at the late infection phase. Many of the downregulated DEGs were found in amino acid and energy metabolism pathways. Using metabolomics approach, we then analyzed the changes in metabolite levels in the PaP1-infected host compared to un-infected controls. Thymidine was significantly increased in the host after PaP1 infection, results that were further supported by increased expression of a PaP1-encoded thymidylate synthase gene. Furthermore, the intracellular betaine concentration was drastically reduced, whereas choline increased, presumably due to downregulation of the choline–glycine betaine pathway. Interestingly, the choline–glycine betaine pathway is a potential antimicrobial target; previous studies have shown that betB inhibition results in the depletion of betaine and the accumulation of betaine aldehyde, the combination of which is toxic to P. aeruginosa. These results present a detailed description of an example of phage-directed metabolism in P. aeruginosa. Both phage-encoded auxiliary metabolic genes and phage-directed host gene expression may contribute to the metabolic changes observed in the host.

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